What Type of Sealant Should Be Used for UHPC Curtain Wall Panel Joints?

For the joint treatment of UHPC curtain wall panels, neutral weather-resistant silicone sealant or polyurethane sealant is preferred; silicone sealant is the first choice for outdoor use (strong weather resistance), while polyurethane sealant is suitable for indoor or humid environments (superior adhesion). The core requirements are compatibility with UHPC material, anti-aging performance, and non-corrosiveness. Through strictly selected sealant brands and standardized construction, Qinglong achieves a 100% pass rate for joint waterproofing and a service life of ≥10 years.

1. Sealant Type Selection: Matching Scenarios and Performance Requirements

Different scenarios require targeted sealant selection. Standard outdoor scenarios: neutral weather-resistant silicone sealant, UV-resistant and anti-aging, with tensile adhesion strength ≥1.5MPa and an applicable temperature range of -40°C to 80°C; Qinglong selects high-end silicone sealant compliant with the GB/T 14683 standard, achieving an outdoor service life of 15 years. Humid/underwater scenarios: polyurethane sealant, with strong adhesion (tensile adhesion strength ≥2.0MPa) and excellent water resistance, suitable for indoor humid areas such as basements and bathrooms; Qinglong's polyurethane sealant has passed a 7-day water immersion test with no decline in adhesion strength. Special functional requirements: fire-resistant sealant for fire-protection scenarios (fire resistance limit ≥1.5 hours), low-temperature curing silicone sealant for low-temperature scenarios (applicable at -20°C); Qinglong offers dedicated sealant solutions for special scenarios.

2. Core Sealant Requirements: Compatibility, Durability, and Safety

Sealants must meet three core requirements to avoid later problems. Material compatibility: must not cause corrosive reactions with UHPC or stain the panel surface; all Qinglong sealants have passed compatibility tests, ensuring no whitening or corrosion. Durability indicators: after 1,000 hours of artificial accelerated aging, tensile adhesion strength retention ≥80% and volume shrinkage ≤5%; Qinglong sealants have a 100% pass rate in aging tests. Environmental protection and safety: VOC content ≤50g/L, no irritating odor, compliant with green building requirements; Qinglong uses eco-friendly sealants that have obtained Ten Ring certification.

3. Qinglong's Joint Treatment Process and Quality Control

Standardized processes and testing ensure joint sealing performance. Construction process: the joint is reserved at a width of 8-12mm; after thorough cleaning, a foam backer rod is inserted (diameter 20% larger than the joint width); sealant is applied with specialized tools, forming an arc-shaped sealant joint (radius ≥5mm); Qinglong construction personnel receive specialized training, with sealant joint flatness ≤1mm. Quality inspection: a water spray test is conducted after sealing (30 minutes with no leakage), and sampling tests are performed on sealant Shore hardness (20-30) and tensile adhesion strength; Qinglong's inspection coverage rate reaches 100%. Project cases: the joints of UHPC perforated panels at the Ouargla Hotel in Algeria used neutral weather-resistant silicone sealant; after 10 years of exposure to high temperatures overseas, there has been no cracking or leakage. The joints of translucent panels at Shanghai New World Plaza use custom-colored sealant matching the panel color, achieving a seamless visual effect.